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Boston Bruins fans watch as Washington Capitals center Nicklas Backstrom is surrounded by teammates after his game-winning goal during the second overtime period of Game 2 of an NHL hockey Stanley Cup first-round playoff series in Boston, Saturday, April 14, 2012. The Capitals won 2-1, tying the series at 1-1. (AP Photo/Charles Krupa)

Robert Mueller’s special counsel investigation into Russian meddling in the 2016 election has cost $6.7 million during the first four and a half months of the probe. Click to see past independent counsel investigations guilty of racking up high bills.